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单选题
Given the uncompleted code of a class： class Person { String name， department； int age； public Person（String n）{ name = n； } public Person（String n， int a）{ name = n； age = a； } public Person（String n， String d， int a） { // doing the same as two arguments version of constructor // including assignment name=n，age=a department = d； } } Which expression can be added at the "doing the same as..." part of the constructor？（）
A
Person（n，a）；
B
this（Person（n，a））；
C
this（n，a）；
D
this（name，age）；
参考答案
参考解析
解析：
在同一个类的不同构造方法中调用该类的其它构造方法需要使用this(…)的形式，而且必须是在构造方法的第一行调用，这个和普通的方法重载调用的方式不同，普通的方法可以直接使用方法名加参数来调用，而且调用位置没有限制，因此答案A是不行的，B的语法就是错误的，D的错误在于在父类型的构造函数被调用前不能引用类的成员。构造方法是一个类对象实例化的起点（虽然严格来说首先执行的并不是构造方法的第一个语句，而是内存的分配），因此在构造方法中不能将成员作为参数引用。
更多 “单选题Given the uncompleted code of a class： class Person { String name， department； int age； public Person（String n）{ name = n； } public Person（String n， int a）{ name = n； age = a； } public Person（String n， String d， int a） { // doing the same as two arguments version of constructor // including assignment name=n，age=a department = d； } } Which expression can be added at the "doing the same as..." part of the constructor？（）A Person（n，a）；B this（Person（n，a））；C this（n，a）；D this（name，age）；” 相关考题
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单选题Given a class Repetition： 1.package utils； 2. 3.public class Repetition{ 4.public static String twice（Strings）{returns+s；} 5.} and given another class Demo： 1.//insert code here2. 3.public class Demo{ 4.public static void main（String[]args）{ 5.System.out.println（twice（"pizza"））； 6.} 7.} Which code should be inserted at line 1 of Demo.java to compile and run Demo to print“pizzapizza”？（）A
import utils.*；B
static import utils.*；C
importutils.Repetition.*；D
static importutils.Repetition.*；E
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import static utils.Repetition.twice；G
static import utils.Repetition.twice；
考题
单选题Given the uncompleted code of a class： class Person { String name， department； int age； public Person（String n）{ name = n； } public Person（String n， int a）{ name = n； age = a； } public Person（String n， String d， int a） { // doing the same as two arguments version of constructor // including assignment name=n，age=a department = d； } } Which expression can be added at the "doing the same as..." part of the constructor？（）A
Person（n，a）；B
this（Person（n，a））；C
this（n，a）；D
this（name，age）；
考题
单选题Given the following code： public class Person{ int arr[] = new int[10]； public static void main（String a[]） { System.out.println（arr[1]）； } } Which statement is correct？（）A
When compilation some error will occur.B
It is correct when compilation but will cause error when running.C
The output is zero.D
The output is null.
考题
单选题Given a class Repetition： 1. package utils； 2. 3. public class Repetition { 4. public static String twice（String s） { return s + s； } 5. } and given another class Demo： 1. // insert code here 2. 3. public class Demo { 4. public static void main（String[] args） { 5. System.out.println（twice（”pizza”））； 6. } 7. } Which code should be inserted at line 1 of Demo.java to compile and run Demo to print“pizzapizza”？（）A
import utils.*；B
static import utils.*；C
import utils.Repetition.*；D
static import utils.Repetition. *；E
import utils.Repetition.twice（）；F
import static utils.Repetition.twice；G
static import utils.Repetition.twice；
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